Advanced controller design and load mitigation method for large scale wind power systems

Recent years have seen larger and more flexible wind turbines. The degree of coupling between flexible modes increases and the modeling of wind turbines becomes more complex and challenging. Thus, advanced multivariable control design methods are preferable to meet the multiple control objectives. In this paper, considering a commercial wind turbine model of the CART2, we describe the commercial wind turbine baseline controller system. Then, the advanced pitch controller and generator torque controller based on LQR algorithms are designed. In comparison with traditional controllers, the proposed one can deal with the wind disturbance more effectively, and mitigate the system loads by increasing the damper of the first fore-aft tower vibration mode and the drive train torsion mode simultaneously. The effectiveness and performance of the proposed strategy are validated by numerical simulations based on Simulink and FAST.